16780832381 has 4 divisors (see below), whose sum is σ = 16783393500. Its totient is φ = 16778271264.

The previous prime is 16780832359. The next prime is 16780832401. The reversal of 16780832381 is 18323808761.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15813062500 + 967769881 = 125750^2 + 31109^2 .

It is a cyclic number.

It is not a de Polignac number, because 16780832381 - 2²² = 16776638077 is a prime.

It is a super-2 number, since 2×16780832381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16780832581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1270706 + ... + 1283843.

It is an arithmetic number, because the mean of its divisors is an integer number (4195848375).

Almost surely, 2^16780832381 is an apocalyptic number.

It is an amenable number.

16780832381 is a deficient number, since it is larger than the sum of its proper divisors (2561119).

16780832381 is an equidigital number, since it uses as much as digits as its factorization.

16780832381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2561118.

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 16780832381 in words is "sixteen billion, seven hundred eighty million, eight hundred thirty-two thousand, three hundred eighty-one".